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20 hours ago •
Yhzhtk
Yhzhtk
Android开发自定义浏览器，对特定URL请求进行捕捉和内容替换
package yh.andr;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Locale;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;
/**
* @author gudh
* 自定义浏览器Client
*/
public class MyWebViewClient extends WebViewClient {
private Activity act;
public MyWebViewClient(Activity act){
this.act = act;
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
System.out.println(url);
view.loadUrl(url);
return true;
}
@Override
public void onLoadResource(WebView view, String url) {
super.onLoadResource(view, url);
}
@Override
public WebResourceResponse shouldInterceptRequest(WebView view,
String url) {
System.out.println("loadRes: " + url);
return getResource(url);
}
public WebResourceResponse getResource(String url){
WebResourceResponse res = null;
if (url.toLowerCase(Locale.getDefault()).endsWith(".png")) { // 替换图片
System.out.println("load jpg:" + url);
BitmapDrawable in = (BitmapDrawable) act.getResources().getDrawable(R.drawable.ic_launcher);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
in.getBitmap().compress(Bitmap.CompressFormat.PNG, 100,
stream);
ByteArrayInputStream bis = new ByteArrayInputStream(stream
.toByteArray());
res = new WebResourceResponse("image/png", "UTF-8", bis);
}else if(url.contains(".cn")){ // 替换网页
System.out.println("have cn: " + url);
try {
String html = "<html><title>已捕捉<title><body><h1>该页面已被替换</h1></body></html>";
ByteArrayInputStream bis = new ByteArrayInputStream(html.getBytes("utf-8"));
res = new WebResourceResponse("text/html", "UTF-8", bis);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
return res;
}
}
WebViewClient主要帮助WebView处理各种通知、请求事件的，比如：
onLoadResource onPageStart onPageFinish onReceiveError onReceivedHttpAuthRequest
WebChromeClient主要辅助WebView处理Javascript的对话框、网站图标、网站title、加载进度等比如：
onCloseWindow(关闭WebView) onCreateWindow() onJsAlert (WebView上alert无效，需要定制WebChromeClient处理弹出) onJsPrompt onJsConfirm onProgressChanged onReceivedIcon onReceivedTitle
看上去他们有很多不同，实际使用的话，如果你的WebView只是用来处理一些html的页面内容，只用WebViewClient就行了，如果需要更丰富的处理效果，比如JS、进度条等，就要用到WebChromeClient。
